Is it possible to copy a set of cookies from one domain to another. I really need this for web development.
No, the same origin policy prohibits sites from setting or reading cookies on behalf of other sites beyond a few special cases. Some browser extensions will allow you to copy and paste cookies to manually sync them.
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goto tools-> page information. select the security tab. cookie browsing button. enter the domain you want to read. write down all cookies and their contents. Go to the domain you want to copy. install add greasemonkey for firefox (or better yet, use Cookies Manager + :: add-ons for Firefox!). run some javascript code to recreate the mentioned cookeis and their values.